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Proceedings Paper

MiniTAO/MAX38 first light: 30-micron band observations from the ground-based telescope
Author(s): Tomohiko Nakamura; Takashi Miyata; Shigeyuki Sako; Kentaro Asano; Mizuho Uchiyama; Toshihiko Tanabe; Mizuki Yoneda; Yoshifusa Ita; Takashi Onaka; Hirokazu Kataza; Tsutomu Aoki; Mamoru Doi; Toshihiro Handa; Daisuke Kato; Kimiaki Kawara; Kotaro Kohno; Masahiro Konishi; Shintaro Koshida; Takeo Minezaki; Natsuko Mitani; Kentaro Motohara; Ryo Ohsawa; Takao Soyano; Masuo Tanaka; Ken'ichi Tarusawa; Koji Toshikawa; Yuzuru Yoshii
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Paper Abstract

We successfully carried out 30-micron observations from the ground-based telescope for the first time with our newly developed mid-infrared instrument, MAX38, which is mounted on the University of Tokyo Atacama 1.0-m telescope (miniTAO telescope). Thanks to the high altitude of the miniTAO (5,640m) and dry weather condition of the Atacama site, we can access the 30-micron wavelength region from ground-based telescopes. To achieve the observation at 30- micron wavelength, remarkable devices are employed in MAX38. First, a Si:Sb 128x128 array detector is installed which can detect long mid-infrared light up to 38-micron. Second, we developed metal mesh filters for 30-micron region band-pass filter, which are composed of several gold thin-films with cross-shaped holes. Third, a cold chopper, a 6-cm square plane mirror controlled by a piezoelectric actuator, is built into the MAX38 optics for canceling out the atmospheric turbulence noise. It enables square-wave chopping with a 50-arcsecound throw at a frequency more than 5- Hz. Finally, a low-dispersion grism spectrometer (R~50) will provide information on the transmission spectrum of the terrestrial atmosphere in 20 to 40 micron. In this observation, we clearly demonstrated that the atmospheric windows around 30-micron can be used for the astronomical observations at the miniTAO site.

Paper Details

Date Published: 20 July 2010
PDF: 8 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773561 (20 July 2010); doi: 10.1117/12.856228
Show Author Affiliations
Tomohiko Nakamura, The Univ. of Tokyo (Japan)
Takashi Miyata, The Univ. of Tokyo (Japan)
Shigeyuki Sako, The Univ. of Tokyo (Japan)
Kentaro Asano, The Univ. of Tokyo (Japan)
Mizuho Uchiyama, The Univ. of Tokyo (Japan)
Toshihiko Tanabe, The Univ. of Tokyo (Japan)
Mizuki Yoneda, Tohoku Univ. (Japan)
Yoshifusa Ita, Tohoku Univ. (Japan)
Takashi Onaka, The Univ. of Tokyo (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science (Japan)
Tsutomu Aoki, The Univ. of Tokyo (Japan)
Mamoru Doi, The Univ. of Tokyo (Japan)
Toshihiro Handa, The Univ. of Tokyo (Japan)
Daisuke Kato, The Univ. of Tokyo (Japan)
Kimiaki Kawara, The Univ. of Tokyo (Japan)
Kotaro Kohno, The Univ. of Tokyo (Japan)
Masahiro Konishi, The Univ. of Tokyo (Japan)
Shintaro Koshida, The Univ. of Tokyo (Japan)
Takeo Minezaki, The Univ. of Tokyo (Japan)
Natsuko Mitani, The Univ. of Tokyo (Japan)
Kentaro Motohara, The Univ. of Tokyo (Japan)
Ryo Ohsawa, The Univ. of Tokyo (Japan)
Takao Soyano, The Univ. of Tokyo (Japan)
Masuo Tanaka, The Univ. of Tokyo (Japan)
Ken'ichi Tarusawa, Kiso Observatory, The Univ. of Tokyo (Japan)
Koji Toshikawa, The Univ. of Tokyo (Japan)
Yuzuru Yoshii, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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